收藏本站
ICS810001DK-21 REVISION B APRIL 13, 2010
14
2010 Integrated Device Technology, Inc.
ICS810001-21 Data Sheet
FEMTOCLOCK DUAL VCXO VIDEO PLL
VCXO-PLL EXTERNAL COMPONENTS
Choosing the correct external components and having a proper
printed circuit board (PCB) layout is a key task for quality operation of
the VCXO-PLL. In choosing a crystal, special precaution must be
taken with the package and load capacitance (CL). In addition,
frequency, accuracy and temperature range must also be
considered. Since the pulling range of a crystal also varies with the
package, it is recommended that a metal-canned package like HC49
be used. Generally, a metal-canned package has a larger pulling
range than a surface mounted device (SMD). For crystal selection
information, refer to the VCXO Crystal Selection Application Note.
The crystal’s load capacitance CL characteristic determines its
resonating frequency and is closely related to the VCXO tuning
range. The total external capacitance seen by the crystal when
installed on a board is the sum of the stray board capacitance, IC
package lead capacitance, internal varactor capacitance and any
installed tuning capacitors (CTUNE).
If the crystal CL is greater than the total external capacitance, the
VCXO will oscillate at a higher frequency than the crystal
specification. If the crystal CL is lower than the total external
capacitance, the VCXO will oscillate at a lower frequency than the
crystal specification. In either case, the absolute tuning range is
reduced. The correct value of CL is dependant on the characteristics
of the VCXO. The recommended CL in the Crystal Parameter Table
balances the tuning range by centering the tuning curve.
The frequency of oscillation in the
third overtone mode is not
necessarily at exactly three times
the fundamental frequency. The
mechanical properties of the
quartz element dictate the
position of the overtones relative
to the fundamental. The oscillator
circuit may excite both the
fundamental and overtone modes
simultaneously. This will cause a
nonlinearity in the tuning curve.
This potential problem is why
VCXO crystals are required to be
tested for absence of any activity inside a ±200ppm window at three
times the fundamental frequency. Refer to FL_3OVT and FL_3OVT_spurs
in the crystal Characteristics table.
The crystal and external loop filter components should be kept as
close as possible to the device. Loop filter and crystal traces should
be kept short and separated from each other. Other signal traces
should be kept separate and not run underneath the device, loop
filter or crystal components.
VCXO Characteristics Table
VCXO-PLL Loop Bandwidth Selection Table
LF0
LF1
ISET
XTAL_IN
XTAL_OUT
RS
C
S
C
P
R
SET
C
TUNE
C
TUNE
19.44MHz
Symbol
Parameter
Typical
Units
kVCXO
VCXO Gain
6.6
kHz/V
CV_LOW
Low Varactor Capacitance
15
pF
CV_HIGH
High Varactor Capacitance
29
pF
Bandwidth
Crystal Frequency (MHz)
M
RS (k)CS (F)
CP (F)
RSET (k)
6Hz (Low)
27
4004
175
4.7
0.01
8.0
80Hz (Mid)
27
1000
150
0.22
0.001
2.21
475Hz (High)
27
92
125
0.1
0.0001
3.3
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
ICS81006AKLFT IC VCXO TO 6 LVCMOS OUT 20VFQFPN
ICS810525AGILF IC VCXO-LVCMOS/LVTTL 16-TSSOP
ICS813076CYILF IC VCXO-PLL WIRELESS 64-TQFP
ICS813078BYILF IC VCXO PLL WIRELESS 64TQFP
ICS813323BGLF IC ATTENUATOR/MULTIPLIER 24TSSOP
ICS840002AGLF IC FREQ SYNTHESIZER 16-TSSOP
ICS840022AKI-02LF IC CLOCK GENERATOR 16VFQFPN
ICS84021AYLF IC SYNTHESIZER HIGH FREQ 32-LQFP
相关代理商/技术参数
ICS810-06 制造商:ICS 制造商全称:ICS 功能描述:VCXO-TO-6 LVCMOS OUTPUTS
ICS81006AK 制造商:ICS 制造商全称:ICS 功能描述:VCXO-TO-6 LVCMOS OUTPUTS
ICS81006AKI 制造商:ICS 制造商全称:ICS 功能描述:VCXO-TO-6 LVCMOS OUTPUTS
ICS81006AKILF 功能描述:IC VCXO TO 6 LVCMOS OUT 20VFQFPN RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:HiPerClockS™ 标准包装:1,000 系列:- 类型:时钟/频率合成器，扇出分配 PLL:- 输入:- 输出:- 电路数:- 比率 - 输入:输出:- 差分 - 输入:输出:- 频率 - 最大:- 除法器/乘法器:- 电源电压:- 工作温度:- 安装类型:表面贴装 封装/外壳:56-VFQFN 裸露焊盘 供应商设备封装:56-VFQFP-EP（8x8） 包装:带卷 (TR) 其它名称:844S012AKI-01LFT
ICS81006AKILFT 功能描述:IC VCXO TO 6 LVCMOS OUT 20VFQFPN RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:HiPerClockS™ 标准包装:1,000 系列:- 类型:时钟/频率合成器，扇出分配 PLL:- 输入:- 输出:- 电路数:- 比率 - 输入:输出:- 差分 - 输入:输出:- 频率 - 最大:- 除法器/乘法器:- 电源电压:- 工作温度:- 安装类型:表面贴装 封装/外壳:56-VFQFN 裸露焊盘 供应商设备封装:56-VFQFP-EP（8x8） 包装:带卷 (TR) 其它名称:844S012AKI-01LFT
ICS81006AKIT 制造商:ICS 制造商全称:ICS 功能描述:VCXO-TO-6 LVCMOS OUTPUTS
ICS81006AKLF 功能描述:IC VCXO LOW PHASE NOISE 20-VFQFN RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:HiPerClockS™ 标准包装:2,000 系列:- 类型:PLL 频率合成器 PLL:是 输入:晶体 输出:时钟 电路数:1 比率 - 输入:输出:1:1 差分 - 输入:输出:无/无 频率 - 最大:1GHz 除法器/乘法器:是/无 电源电压:4.5 V ~ 5.5 V 工作温度:-20°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-LSSOP（0.175"，4.40mm 宽） 供应商设备封装:16-SSOP 包装:带卷 (TR) 其它名称:NJW1504V-TE1-NDNJW1504V-TE1TR
ICS81006AKLFT 功能描述:IC VCXO TO 6 LVCMOS OUT 20VFQFPN RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:HiPerClockS™ 标准包装:1,000 系列:- 类型:时钟/频率合成器，扇出分配 PLL:- 输入:- 输出:- 电路数:- 比率 - 输入:输出:- 差分 - 输入:输出:- 频率 - 最大:- 除法器/乘法器:- 电源电压:- 工作温度:- 安装类型:表面贴装 封装/外壳:56-VFQFN 裸露焊盘 供应商设备封装:56-VFQFP-EP（8x8） 包装:带卷 (TR) 其它名称:844S012AKI-01LFT